Patent GB-1453109-A (GB)
Title: Vinyl chloride polymer composition
IPC: C08L51/00
Filed: 1974-03-19
Abstract: 1453109 Vinylchloride polymer/methylmethacrylate composite polymer compositions MITSUBISHI RAYON CO Ltd 19 March 1974 [26 March 1973 19 April 1973 28 May 1973] 12063/74 Heading C3P A thermoplastic vinyl chloride polymer composition comprises (I) 80-99À9 parts by weight based on the total weight of (I) and (II) of polyvinylchloride and/or a copolymer consisting of not less than 80% by weight of vinyl chloride and not more than 20% by weight of at least one other copolymerizable ethylenically unsaturated monomer; (II) 20-0À1 parts by weight based on the total weight of (I) and (II) of a methyl methacrylate composite polymer consisting essentially of (A) 10-60% by weight based on the total weight of composite polymer of polymer consisting essentially of 80-100% by weight of methylmethacrylate, 0-20% by weight of at least one copolymerizable monoethylenically unsaturated monomer and 0-2% by weight of at least one copolymerizable polyfunctional monomer having at least two ethylenically unsaturated double bonds and having a reduced viscosity, # sp./l. of 2-15 as measured in chloroform at 25‹ C. and a concentration of 0À10 g./100 ml.; (B) 40-80% by weight based on the total weight of composite polymer of a polymer consisting essentially of 30-80% by weight of styrene and 70-20% by weight of an acrylic acid ester or a methacrylic acid ester, said polymer being prepared by polymerizing the monomers in the presence of a preformed latex of component A and having a reduced viscosity # sp. /l. of not more than 1À0; (C) 0-40% by weight based on the total weight of composite polymer of a polymer consisting essentially of 80-100% by weight of methyl methacrylate, 0-20% by weight of at least one copolymerizable monoethylenically unsaturated monomer and 0-2% by weight of at least one copolymerizable polyfunctional monomer having at least two ethylenically unsaturated bonds, (C) being prepared by polymerizing monomers thereof by emulsion polymerization in the presence of a preformed latex of component (B) and having a reduced viscosity # sp./l. of at least 0À3, wherein the reduced viscosities of (B) and (C) are determined by polymerizing a monomer charge of said components, and determining the dependence of reduced viscosity on the quantity of chain transfer agent employed. The methyl methacrylate composite polymer may include 0À1 to 5% by weight of at least one anionic surface active agent, which is added to said composite polymer prior to, simultaneously with or after the addition of a coagulating agent to the polymer latex, and the coagulated particles of the composite polymer treated with said surfactant have, prior to drying, a size such that at least 95% of the particles fall within 20-300 microns. The esters of component B may be selected from alkyl and substituted alkyl methacrylates and acrylates wherein the alkyl and substituted alkyl groups contain 1-12 carbon atoms. The copolymerizable unsaturated monomer of (A) and (C) may be selected from aromatic vinyl compounds, unsaturated nitriles, vinyl esters, alkyl acrylates with the alkyl group containing 7-72 carbon atoms and alkyl methacrylates with the alkyl group containing 2-72 carbon atoms. The polyfunctional monomer of (A) and (C) may be selected from the diacrylates and dimethacrylates of ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol; divinylbenzene and triallyl cyanurate. Examples illustrate the use of methylmethacrylate, ethyl acrylate, butyl methacrylate, butyl acrylate, 2-ethylhexyl methacrylate, 2-ethylhexyl acrylate, methyl acrylate, acrylonitrile, styrenes, ethyleneglycol dimethacrylate, triallylcyanurate, diethyleneglycol dimethacrylate and triethyleneglycol dimethacyrlate with sodium stearate as the anionic surfactant.